Copy Units with their lessons (e.g. to use for next year)

We could copy and paste one unit in a subject area to transfer to the next year without coping the entire year's worth of units. What I found I could do was copy and paste a class from year to the next however, I want to be able to just copy and paste individual units. Some units I change and some units I keep the same. I want to have more control over what units I transfer from one year to the next!

Thank you,
5th Grade Teacher